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MessageIdStartCursor.java
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MessageIdStartCursor.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.connector.pulsar.source.enumerator.cursor.start;
import org.apache.flink.connector.pulsar.source.enumerator.cursor.CursorPosition;
import org.apache.flink.connector.pulsar.source.enumerator.cursor.StartCursor;
import org.apache.pulsar.client.api.ConsumerBuilder;
import org.apache.pulsar.client.api.MessageId;
import java.util.Objects;
/** This cursor would leave pulsar start consuming from a specific message id. */
public class MessageIdStartCursor implements StartCursor {
private static final long serialVersionUID = -8057345435887170111L;
private final MessageId messageId;
private final boolean inclusive;
/**
* The default {@code inclusive} behavior should be controlled in {@link
* ConsumerBuilder#startMessageIdInclusive}. But pulsar has a bug and doesn't support this
* feature currently. We have to use admin API to reset the cursor instead.
*
* @param messageId The message id for start position.
* @param inclusive Whether we include the start message id in the consuming result. This works
* only if we provide a specified message id instead of {@link MessageId#earliest} or {@link
* MessageId#latest}.
*/
public MessageIdStartCursor(MessageId messageId, boolean inclusive) {
this.messageId = messageId;
this.inclusive = inclusive;
}
@Override
public CursorPosition position(String topic, int partitionId) {
return new CursorPosition(messageId, inclusive);
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
MessageIdStartCursor that = (MessageIdStartCursor) o;
return Objects.equals(messageId, that.messageId);
}
@Override
public int hashCode() {
return Objects.hash(messageId);
}
}